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I've been reading the forums and I just want to make sure before I spend a bunch of $$$ on wheels, tires and a level kit. I have a 2012 Express 4X4, it appears the stock 20's have an off set of either +19 or +20.
If if buy wheels the are close to that off set and install Bilstiens for the level there should be no issues?
Will I need a wheel spacer?
How much off set can I get away without causing issues?
I still need to find out the off set on the wheels I'm looking at but I might have to call the manufacturer as they don't list it on there site. They do list the back space at 5.7 but I'm not sure what this puts the off set at.

In order to calculate the offset based off the backspace we would need to know what size wheels the ones you are looking at are.

Additionally if you are looking at a level with bilsteins a +19mm offset would work and this is what you factory rims are, however this is only true if you are going to run a tire close to the factory tire size as far width goes. Most who level there trucks with bilsteins will either run a +0 or +6.

hope this info helps, if you nees help with finding your wheels and tire let us know we work with almost any Manufacturer and can get you very competitive pricing and information on just about anything you can think of when it comes to these trucks.

I'm looking at Mamba M1's 20X9 and BF Goodrich Rugged Terrain TA 275/60/20. I'm guessing this would work as the tires are the same size as stock and I think the wheels are very close to the stock dimensions also.
From what I saw on the Mamba website, they only offer these wheels in 5.7 backspacing.
I am ready to pull the trigger on the purchase, just want to be sure everything I'm thinking about will work.

Send me a PM if you want to offer me a package deal on the wheels, tires and Bilstiens.